package cn.itcust.context;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/contextDemo2")
public class ContextDemo2 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        /**
         *  <1>. 获取MIME类型
         *      MIME类型：在互联网通信过程中定义的一种文件数据类型
         *      格式：大类型/小类型    text/html   image/jpeg

         *      获取：String getMimeType(String file)

            <2>. 域对象：共享数据
            <3>. 获取文件的真实(服务器)路径
         *
         */

        // 2. 通过HttpServlet获取
        ServletContext context = this.getServletContext();

        // 3. 定义文件名称
        String filename = "a.jpg";

        // 4. 获取MIME类型
        String mimeType = context.getMimeType(filename);
        System.out.println(mimeType);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}
